08/17/16

Centre of gravity of a lamina
Find the centroid of the region bounded by y=2-2x and y=x
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08/17/16

height of a ball drop
a certain ball is dropped from a height of x feet. it always bounces up to (2/3)x feet. suppose the ball is dropped from 10 feet and is stopped exactly when it touches the ground after the 30th... more
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08/17/16

You have 2 bottles, a 3 gallon bottle and a 5 gallon bottle. How can u measure exactly 4 gallons?
You have 2 bottles, a 3 gallon bottle and a 5 gallon bottle. How can u measure exactly 4 gallons?
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08/17/16

Mechanics question help please
There is a fixed wedge whose smooth sloping face is inclined at 30 degree to the horizontal. A particle P of mass 2 kg rests on the sloping face of the wedge. A light inextensible string, passes... more
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08/17/16

Mechanics question please help
A car whose engine can work at a maximum rate of 20 kW is traveling along a straight horizontal road. The maximum speed of the car is 40 m/s. Find the resistance to motion. The car, which is of... more
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08/15/16

How much electricity will be generated when a 100 kg powerful magnet (velocity 4 centimeter/sec linear motion)pass through a 50 kg. coil (50000 turns)
 How much electricity will be generated when a 100 kg powerful magnet (velocity 4 centimeter/sec linear motion)pass through a 50 kg. coil (50000 turns) This 100 kilogram magnet will move in back... more
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08/12/16

A right triangle has a hypotenuse that is 3 feet longer than one leg. The other leg is 4 feet.
Please explain how you solved it.
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08/12/16

Solve this Word Problem
You are making an open box from a rectangular sheet of cardboard by cutting squares 2 inches in length from each corner and folding up the sides. The length of the cardboard is 8 inches more than... more
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08/12/16

hydrogen does not possess any property of metal,but then also it is considered as metal,why?
question from a student who is in class 8
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08/12/16

6. Which of these involves a physical change and NOT a chemical reaction?
1. apples decaying2. iron rusting3. frying bacon4. boiling water
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08/12/16

12. Which of these process is always endothermic?
1. burning2. condensation3. freezing4. Boiling
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08/10/16

magnetic field
From a cylinder of radius r , a cylinder of radius r/2 is removed . Current flowing through the remaining cylinder is I . Then why the magnetuc field inside the cavity is constant
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08/08/16

I am having a doubt in heat transfer (mechanical engineering).
I am working in an fmcg company where 'Thermic fluid lines' are used for drying chilly coriander garlic and cumin. The output of the thermic fluid is 6 lakh Kcal/hour. The load of thermic fluid... more
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08/08/16

A wavelength of 625nm is used in a Young’s double-slit experiment. How many bright fringes lie on the screen?
A wavelength of 625nm is used in a Young’s double-slit experiment. The separation between the slits is d = 1.4 × 10^−5 m. The total width of the screen is 0.20 m. In one version of the setup, the... more
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08/07/16

what does a tensor product actually do? does it make a new vector space out of the constituent spaces? and if so how would you mal a basis for it?
Thanks, any help and references for good diffrential geometry booms would be greatly appreciated    Sincerely, a wanna be theoretical physic(ian)
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08/07/16

how would I go about proving the Helmholtz decomposition thereon?
Well my problem specifically is with the diffrential^3(r'-r) I know its not a diffrential but what is it really and how is that derived?
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08/07/16

(b) How far does the skier travel on the horizontal surface before coming to rest? Neglect air resistance
Estimate the totalmechanical work done by the two men in lifting the boat 24 times, assuming they applied the same force to the boat during each lift. (Neglect any work they may have done allowing... more
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08/07/16

Estimate the total mechanical work done by the two men in lifting the boat 24 times, assuming they applied the same force to the boat during each lift. (Neglec
The record number of boat lifts, including the boat and its ten crew members, was achieved by Sami Heinonen and Juha Räsänen of Sweden in 2000. They lifted a total mass of 653.2 kg approximately 4... more
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08/07/16

A 75.0 kg skier slides down a 75.0 m high slope without friction. The velocity of the skier at the bottom of the slope is
A 75.0 kg skier slides down a 75.0 m high slope without friction. The velocity of the skier at the bottom of the slope is
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08/07/16

What is the change in gravitational potential energy, in Joules?
A 20.0 kg box slides up a 12.0 m long incline at an angle of 30.0 degrees with the horizontal. A force of 150 N is applied to the box to pull it up the incline. The applied force makes an angle of... more
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08/06/16

Mechanics question
A heavy ring of mass 5 kg is threaded on a fixed rough horizontal rod. The coefficient of friction between the ring and the rod is 0.5. A light string is attached to the ring and is pulled... more
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08/06/16

Mechanics question please help
(A) Two particles P and Q of masses 10 kg and 5 kg respectively are attached to the ends of a light in-extensible string. The string passes a fixed smooth peg. ( It's something like two particles... more
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08/06/16

(a) what maximum force can be exerted by the string on the 10.0-kg block without causing the 5.00-kg block to slip? (b) Use the system approach to calculate the
A block of mass m = 5.00 kg rides on top of a second block of mass M = 10.0 kg. A person attaches a string to the bottom block and pulls the system horizontally across a frictionless surface, as in... more
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08/06/16

can someone explain how to prove the acceleration of tangents vectors is equal to the chrystoffle symbol plus an orthogonal vector
I know the acceleration isnt a part of the tangent space so how do you prove the acceleration of the basis vector field i along another one j is the chrystoffle symbol plus thay orthogonal vector
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08/05/16

nabla^3 u=0
Is it true or not?
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